Change gear attachment for machines



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July 30, 1935; c. BOUILL'ON 2,009,725

CHANGE GEAR ATTACHMENT FOR MACHINES Filed July 23, 1951 5 Sheets-Sheet :5

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6mm mum Patented Jul 3 1935 I: CHANGE GEAR ATTACHMENT FOR Y I MACHINES (lonstantBouillon, Torrington, Conn., assignor to The Hendey Machine Company, Torrington, Conn., a corporation of Connecticut Application July 23, 1931, Serial No. 552,669

3 Claims. (01. 8226) v This invention relates to lathes and machines of like character and more particularly to feed mechanismsfor moving the carriage and tool support in direct relation to the speed of the work spindle of the machine.

In the conventional design of lathes it is the common practice to provide change-gear mechanism actuated directlyfrom the spindle to give a direct ratio of longitudinal feed between the carriagethat supports the cutting tool, and the head-stock spindle that revolves the work to be operated upon. This direct ratio is an important factor where the lathe is utilized in a thread cutting operation and the threads cut a desired lead and within certain limits.

'To accomplish this result the lathe is provided with a head-stock having the usual spin-v dle rotatably mounted therein. Various combinations of change gears are used in effecting a desired basic ratio of drive from the spindle to the quick change-gear box that directly or indirectly rotates the lead screw' andwhich is effective in longitudinally moving the carriage and apron along the'bed at the desired rate of speed, according to the combination of gears selected, to produce the desired longitudinal feed of the tool relative to the work. Speeds and feeds utilized in the operation of thread cutting are of arelatively-low ratio with the cutting tool point of desired shape. to properly form the side angles and root of the thread.

In the arrangement of the above change-gear mechanism it is general practice to provide the head-stock spindle with a driving pinionwhich maybe engaged or disengaged by an intermediate sliding gear which operates the interchangeable gears cooperating with the compound gear box. This compound gear box comprises a cone of varying ratio quick change gearing which operates the main quick change gear box containing a cone of selective gears which operate the lead screw. With this arrangement of gearing various combinations may be quicklyselected to effect a given ratio of speed between the spindle and lead screw which actuates the carriage,

It is often desirableto usethe above-mentioned thread cutting lathe in turning operations which presents attendant difficulties as it has been found more practical inturning operations to use an. exceedingly greater spindle speed to revolve the work than is desirable or practical in thread cutting operations. While the thread cutting operation requires that adirect ratio be maintained between the spindle and longitudinal feed, turning operationsto produce a desired finish are usually accomplished with an exceedingly slow feed and high spindle speed and this ratio of feed is impractical to obtain through the regular arrangement of gearing from the desired high rate 5' of spindle speed as this would require toogreat a reduction through the interchangeable gears which are required for thread cutting operations.

Accordingly, the object of my present invention is to provide an auxiliary feed mechanism so organized and adapted that it may be interpositioned with the regular gearing for conversion from the regular ratio of speeds and feeds of a thread cutting lathe to the most desirable ratio of speeds and feeds for turning operations.

Another object of my invention is the organization of parts in a unit adaptable to be conveniently attached to the present design of engine lathe now in use and equipped for thread cutting operations and whereby the lathe may be converted into a high speed turning lathe.

With the above and other objects in view my invention consists ina novel combination and arrangementof parts hereinafter described and more specifically pointed out in the appended claims.

In the accompanying drawings I have shown a preferred and modified form of my invention sufficient to enable those skilled in the art to understand the construction and operation thereof. 7

Referring to the drawings:

Fig. 1 .is a partial front elevationof a lathe having my attachment associated therewith, a portion of the attachment being shown detached;

Fig. 2 is an end elevation of the gear train, on an enlarged-scale; viewing in direction of arrow 0,

Fig. 3 is substantially a vertical section; a portion of the gear train with reverse gearing; and

Fig. 4 is a sectional view showinga modification of the driving pinion and engaging arrangement. Y Referring to the drawings III is a portion of a lathe bed'mounted on the usual pedestals H. Secured to the lathe bed I0 is the headstock l2 which has rotatably mounted therein the work' spindle I3. Inthis instance a cone pulley I4 is shown mounted on the spindle, said pulley being driven by any suitable means, not shown.

Secured on the outer end of the spindle I3 is a driving pinion l5 which is engaged by a gear l6 slidably mounted on a stud Ilsecured in the headstock l2. At Fig. 1 the gear I6 is shown in its engaged position with the driving pinion I5 and the gear [8 which rotates the feed shaft l9 mounted in suitable bearings in the headstock l2, see Figs. 1, 2, and 3.

Secured on the outer end of the feed shaft 19 and driven thereby is a pinion 20a meshing with and driving the sector gear 20 secured to the bushing 2| which is rotatably mounted on the stud 22 secured in the sector 23, said sector bein of the usual construction and adapted to receive gears interchangeable with gear 28 to give a desired change in the ratio of the gear train. Secured on the bushing 21, withthegear-fifl; is a gear 24 which meshes with and drives the gear 25 associated with and driving the change gears of the compound gear box 26 and 'quick change gear box 21, the operation of which is well known in the art and set forth in Patent No. 519,924 issued to W. P. Norton, May 15, 1894.

Actuated through the quick change gear box 2! is the lead screw 28 which engages with and traverses the apron 29 and carriage 3%! which has mounted thereon the usual tool support.

The above elements and the operation thereo are conventional in engine and thread cutting lathes and wellknown in the art therefore further detailed description is unnecessary.

, As above mentioned the longitudinallyslidable gear-l6 may be disengaged from the pinion I5 as illustrated at Fig. 3,"and. this permits the spindle l3 being rotated at a desired speed with the feed gearing inoperative. To produce an optional low feed speed I have provided a-detachable unit which comprises'a shaft 3|, shown detached at Fig. 1, which is threaded at its inner end for positioned engagement with athreaded bore provided in-the headstock, see Fig. 2. The shaft 3| has rotatably mounted thereon a driving pinion 32 formed, in thisinstance, integral with a driven pulley 33. It isobvious that the pinion 32 and driven pulley 33-construction may be modified in various ways such as a sliding pinion, as above describedor by utilizing the well known clutch unit. When in its engaging position, see Fig. 2, the driving pinion3-2 meshes with and'drives the gear l8of the gear-train which through the regu lar quick change gears rotates the lead screw-to produce the desired carriage feed. "I have provided a bracket 34 which is suitably secured to the lathe, said bracket supporting a motor 35 with a :driving pulley 36 which is connected by suitable means, not shown, with the pulley 33. With this attachment I am permitted'to select a motor of desired speed andwith proper driving and driven pulley produce ,a range of feed speeds 1 bestsadapted to turning operations. i

In common practice a lathe of the 'above'referred to type is provided-with twelve 'changes'of feed in the quick change gear box and through the compound gear box thirty-six changes "are obtained. I

Without sacrificing any of the advantages. of the above feeds for thread'cutting and the like; with my attachment thirty-six additional. proportionate feeds are obtained.

At Fig. 4, I have shown a modification of the attachment drive gearing associated with the usual reversing gears which comprise bevel pin ions 38, 39 freely mounted on thefeed shaft [5, said pinions being meshed with bevel pinion 40 rotatably mounted in a suitable bearingvin the headstock; The clutch 4| is slidably keyed: on the shaft 19 and adapted to be engaged with the bevel pinions 38 or 39 to produce the desired direction of rotation to the 'feed gearing as set forth in the patent to Norton above referred to. The bevel pinion 38 is provided with an extending hub 38a, which has secured thereto the driving gear I8 also a bevel gear 42 which meshes with and is driven by the bevel pinion 43 rotatably mounted in a suitable bearing 44. The pinion 43 has secured thereto a clutch face, 45 adapted to be engaged by the clutch 46 slidably secured to the drive shaft 41. The shaft 41 is provided with a coupling 48 by which it may be secured to, and driven by, any suitable means.

With this arrangement of parts the gears are inmesh at all times, the auxiliary driving means being engaged through the manipulation of the clutch. With this construction it is manually possible to disengage the sliding gear l6 and engage the clutch 46 to accomplish the results as above mentioned. It is advisable to synchronize the specific details herein disclosed; and while I have shown my attachment associated with a particular type of machine it is to be understood that-it isfor illustrative purpos'e'oiily as the device may be applied in various ways to different types of machines, but what I claim is:-

' 1; In a lathe having a spindle and a work support, a driving member for the spindle; a main drive gear'train connecting the spind1e (and sup- .po'rt, for driving the'latter at a speed in direct ratio to the speed of the former, said train in eluding means also for driving the support from an auxiliary source of power, while the main drive is disconnected; an auxiliary drive "for the support, and means rendering said auxiliary drive operable'simultaneously with the spindle atan indirect ratio to the spindle speed.

2. In a lathe having a spindle'and a work'siipport, a driving member for the spindlefia main drive gear train connecting the spindle and sup.- port, for driving the latter at a speed in direct ratio tothe speed of the'former, said train including'means also for driving the support from an auxiliary source of power, while themain drive is disconnected; an auxiliary drive'for the support, and means comprising a gear in said main drive slidableon its shaft to remove it from said drive for said support to render said auxiliary drive operable simultaneously with the spindle at an indirect ratio to the spindle speed. I 3. Ina lathe having a spindle and a work support,:a driving member for the spindle; a main drive gear train'connecting the spindle and support, for driving the latter at a speed in direct ratio to the speed of the former, said train including means also for driving the support from an auxiliary source of power while the main drive is disconnected; an auxiliary drive for the support, and means comprising a gear in said drive slidable on its shaft to remove it from said main drive for said support, and an auxiliary gear connecting said train and auxiliary drive adapted to be 'operably positioned therebetween to render said auxiliary drive operable simultaneously with the spindle at an indirect 'ratioto the. spindle speed,

. CONSTANT BOUILLON'. 

